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fix(gzip)!: change the default block size (#529) #553

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Nov 17, 2023
Merged

fix(gzip)!: change the default block size (#529) #553

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8 changes: 7 additions & 1 deletion pkg/overlay/pack.go
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,12 @@ import (
"stackerbuild.io/stacker/pkg/types"
)

// Container image layers are often tar.gz, however there is nothing in the
// spec or documentation which standardizes compression params which can cause
// different layer hashes even for the same tar. So picking compression params
// that most tooling appears to be using.
const gzipBlockSize = mutate.GzipBlockSize(256 << 12)

func safeOverlayName(d digest.Digest) string {
// dirs used in overlay lowerdir args can't have : in them, so lets
// sanitize it
Expand Down Expand Up @@ -418,7 +424,7 @@ func generateLayer(config types.StackerConfig, oci casext.Engine, mutators []*mu
defer blob.Close()

if layerType.Type == "tar" {
desc, err = mutator.Add(context.Background(), mediaType, blob, history, mutate.GzipCompressor, nil)
desc, err = mutator.Add(context.Background(), mediaType, blob, history, mutate.GzipCompressor.WithOpt(gzipBlockSize), nil)
if err != nil {
return false, err
}
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